OperaTor: Portable Browser for Anonymous Browsing

If you prefer anonymous browsing with a portable browser so that you can use it from your USB stick check out OperaTor. The archive file is 7MB download, once downloaded unzip it in your USB drive and use it. There is no install, just click the icon to open the browser.
The author says “The only protocols which OperaTor anonymizes are HTTP and HTTPS, thus if you want to stay anonymous you should avoid using other Opera features (e.g. Java, JavaScript, Bittorrent, integrated e-mail and IRC clients).”